The afternoon of May 10, 2010, saw a significant severe weather event across central and eastern Oklahoma. A small but strong weather system moved into Oklahoma during the afternoon hours. As this system approached, warm and moist air moved into the state. Clear skies allowed temperatures to warm into the 80s. These ingredients combined with strong atmospheric winds to favor widespread severe thunderstorms. As storms formed around 3pm in northern Oklahoma and 4pm in southwest Oklahoma, they quickly became severe and developed rotation, called a supercell. These storms moved very quickly northeast and east, producing destructive hail and strong winds. Several of the storms also produced tornadoes, with some long-track tornadoes noted. Storm damage surveys show at least two EF-4 struck just east of Oklahoma City with an estimated 20+ tornadoes on this day.